diff --git a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-clickhouse.md b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-clickhouse.md
index 53135a64c18..3cf2d0e0d0f 100644
--- a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-clickhouse.md
+++ b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-clickhouse.md
@@ -238,6 +238,9 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
         field:dst_player
       }
 
+      # (Optional) Specify a column as the source of the rank.
+      #ranking: rank
+
       # The number of data written to Nebula Graph in a single batch.
       batch: 256
 
@@ -265,6 +268,10 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
       target: {
         field:teamid
       }
+
+      # (Optional) Specify a column as the source of the rank.
+      #ranking: rank
+
       batch: 256
       partition: 32
     }
diff --git a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-hbase.md b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-hbase.md
index a7d208c0ae1..2eecd7b36f8 100644
--- a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-hbase.md
+++ b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-hbase.md
@@ -267,6 +267,8 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
           field:dst_player
       }
 
+      # (Optional) Specify a column as the source of the rank.
+      #ranking: rank
 
       # The number of data written to Nebula Graph in a single batch.
       batch: 256
@@ -297,6 +299,9 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
           field:teamid
       }
 
+      # (Optional) Specify a column as the source of the rank.
+      #ranking: rank
+
       batch: 256
       partition: 32
     }
diff --git a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-hive.md b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-hive.md
index c3ef7e03f9f..3c8d994aefa 100644
--- a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-hive.md
+++ b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-hive.md
@@ -298,6 +298,9 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
         field: dst_player
       }
 
+      # (Optional) Specify a column as the source of the rank.
+      #ranking: rank
+
       # The number of data written to Nebula Graph in a single batch.
       batch: 256
 
@@ -321,6 +324,10 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
       target: {
         field: teamid
       }
+
+      # (Optional) Specify a column as the source of the rank.
+      #ranking: rank
+
       batch: 256
       partition: 32
     }
diff --git a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-json.md b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-json.md
index 93b02850b6f..b4f9a52a31f 100644
--- a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-json.md
+++ b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-json.md
@@ -303,7 +303,7 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
       }
 
 
-      # (optionally) Specify a column as the source of the rank.
+      # (Optional) Specify a column as the source of the rank.
       #ranking: rank
 
       # The number of data written to Nebula Graph in a single batch.
@@ -348,11 +348,9 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
         field: dst
       }
 
-
-      # (optionally) Specify a column as the source of the rank.
+      # (Optional) Specify a column as the source of the rank.
       #ranking: _c5
 
-
       # The number of data written to Nebula Graph in a single batch.
       batch: 256
 
diff --git a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-kafka.md b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-kafka.md
index 49723585c57..558aceadc97 100644
--- a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-kafka.md
+++ b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-kafka.md
@@ -227,6 +227,8 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
           field:offset
       }
 
+      # (Optional) Specify a column as the source of the rank.
+      #ranking: rank
 
       # The number of data written to Nebula Graph in a single batch.
       batch: 10
@@ -258,6 +260,9 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
           field:value
       }
 
+      # (Optional) Specify a column as the source of the rank.
+      #ranking: rank
+
       batch: 10
       partition: 10
       interval.seconds: 10
diff --git a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-maxcompute.md b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-maxcompute.md
index ae5e2438476..87b451d965b 100644
--- a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-maxcompute.md
+++ b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-maxcompute.md
@@ -261,6 +261,9 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
         field: dst_player
       }
 
+      # (Optional) Specify a column as the source of the rank.
+      #ranking: rank
+
       # The number of Spark partitions.
       partition:10
 
@@ -291,6 +294,10 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
       target:{
         field: teamid
       }
+
+      # (Optional) Specify a column as the source of the rank.
+      #ranking: rank
+
       partition:10
       batch:10
     }
diff --git a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-mysql.md b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-mysql.md
index 9591f02498e..ca69d4c6d4c 100644
--- a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-mysql.md
+++ b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-mysql.md
@@ -277,6 +277,9 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
         field: dst_player
       }
 
+      # (Optional) Specify a column as the source of the rank.
+      #ranking: rank
+
       # The number of data written to Nebula Graph in a single batch.
       batch: 256
 
diff --git a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-orc.md b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-orc.md
index fb33d97ddd6..14647665f42 100644
--- a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-orc.md
+++ b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-orc.md
@@ -270,7 +270,6 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
         field: dst
       }
 
-
       # (Optional) Specify a column as the source of the rank.
       #ranking: rank
 
@@ -319,7 +318,6 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
       # (Optional) Specify a column as the source of the rank.
       #ranking: _c5
 
-
       # The number of data written to Nebula Graph in a single batch.
       batch: 256
 
diff --git a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-parquet.md b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-parquet.md
index 080800b259a..ac5f0dd928c 100644
--- a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-parquet.md
+++ b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-parquet.md
@@ -270,7 +270,6 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
         field: dst
       }
 
-
       # (Optional) Specify a column as the source of the rank.
       #ranking: rank
 
@@ -316,11 +315,9 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
         field: dst
       }
 
-
       # (Optional) Specify a column as the source of the rank.
       #ranking: _c5
 
-
       # The number of data written to Nebula Graph in a single batch.
       batch: 256
 
diff --git a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-pulsar.md b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-pulsar.md
index b387f7a14f1..987e0042317 100644
--- a/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-pulsar.md
+++ b/docs-2.0/nebula-exchange/use-exchange/ex-ug-import-from-pulsar.md
@@ -229,11 +229,12 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
           field:src_player
       }
 
-
       target:{
           field:dst_player
       }
 
+      # (Optional) Specify a column as the source of the rank.
+      #ranking: rank
 
       # The number of data written to Nebula Graph in a single batch.
       batch: 10
@@ -268,6 +269,9 @@ After Exchange is compiled, copy the conf file `target/classes/application.conf`
           field:teamid
       }
 
+      # (Optional) Specify a column as the source of the rank.
+      #ranking: rank
+
       batch: 10
       partition: 10
       interval.seconds: 10